lec on advanced designs

Question 1

what does “two” mean in two way designs?

Answer 1

we are going to vary things in at least two ways. it can be things we control or measure.

Question 2

interaction effects occur when…

Answer 2

the effect of one IV depends on the level of another IV

Question 3

definition of interaction effect

Answer 3

the difference of differences

Question 4

experiments with __ IV(s) can show interactions

Answer 4

2

Question 5

factorial designs study __ IV(s)

Answer 5

2 (or more)

Question 6

factorial designs can:

Answer 6

test limits
test theories
show us main effects and interactions

Question 7

cross over interaction

Answer 7

“it depends”

lines on graph cross over eachother

Question 8

terminating or spreading interaction

Answer 8

“especially when”

lines do not cross , might run parallel to eachother

Question 9

IVs are also called…

Answer 9

factors

Question 10

factorial designs can be used to study what 2 types of variables?

Answer 10

manipulated variables
participant variables

Question 11

in factorial designs, participant variables are treated as ___

Answer 11

IVs

Question 12

what is an example of a participant variable

Answer 12

age, as they cant assign people to be old or young so its just a participant variable

Question 13

if there are 2 IVs with 2 levels in each, how many cells or conditions are there

Answer 13

4 (2 levels of IV1 x 2 levels of IV2)

Question 14

factorial designs testing limits is important for what type of validity?

Answer 14

external validity

Question 15

using factorial designs to test limits is also called ________ ____ _______

Answer 15

testing for moderators

Question 16

whats a moderator

Answer 16

IV that changes the relationship between another IV and DV

it results in an interaction

the effect of one IV is moderated by the level of another IV

Question 17

what type of question do you ask when interpreting if there is a main effect?

Answer 17

is there an overall difference?

Question 18

what type of question do you ask when interpreting if there is an interaction effect?

Answer 18

is there a difference in differences?

Question 19

what is more important, main effects or interactions

Answer 19

interactions

Question 20

when analyzing a factorial study with 2 IVs there are 3 results to interpret. what are they?

Answer 20

2 main effects
1 interaction effect

Question 21

list the factorial variations

Answer 21

• independent groups factorial designs
• within groups factorial designs
• mixed factorial designs
• increasing the number of levels of an independent variable
• increasing the number of independent variables

Question 22

independent groups factorial designs

Answer 22

both IVs are studied as independent groups and both IVs are manipulated BETWEEN groups

Question 23

what are independent groups factorial designs also called

Answer 23

between subjects factorial design

Question 24

within groups factorial designs

Answer 24

both IVs are manipulated WITHIN groups

Question 25

what are within groups factorial designs also called

Answer 25

repeated measures factorial designs

Question 26

in what way are within group designs the most efficient? explain

Answer 26

most efficient in terms of number of participants needed.

if you have a 2x2 within group design, there is only 1 group of participants but they participate in all 4 cells

ex: if u want 50 ppl in each cell u only need 50 ppl total because each of them would be in each of the 4 conditions

Question 27

increasing number of levels of an IV

Answer 27

changes the number of cells (increases it)

Question 28

how are factorials (factors) notated? what does it mean?

Answer 28

____x_____

number of blanks tells u the number of IVs and numbers that you put in the blanks tell you the number of levels of each of the IVs

ex; 12 cells = 3x4 factorial design

Question 29

how are interactions most easily detected?

Answer 29

with a line graph, see if the lines are parallel.

Question 30

what is the best way to represent a design with increased number of IVs (like a 3 way design)

Answer 30

make the 2x2 table twice, once for each level of IV3